由“getEngineFactories”列出的Jython,但“getEngineByName(“Jython”)”为“null”`

<dependency>
  <groupId>org.python</groupId>
  <artifactId>jython</artifactId>
  <version>2.7.0</version>
</dependency>

然后我创建了一个包 src/main/java/mypkg 添加了这个类:

package mypkg;

import javax.script.*;

class JythonMinimalTest {
    public static void main(String[] args) throws Exception {
        String engineName = "python";
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName(engineName);
        if (engine == null) {
            System.err.println("ERROR: `" + engineName + "` not available.");
            System.err.println("Available engines: ");
            for (ScriptEngineFactory factory: manager.getEngineFactories()) {
                System.err.println(factory);
                System.err.println("names:");
                for (String name: factory.getNames()) {
                    System.err.println("  " + name);
                }
            }
            System.exit(999);
        }
        engine.eval("print('hello, world')");
    }
}

exec:java ,

mvn exec:java -Dexec.mainClass=mypkg.JythonMinimalTest

ERROR: `python` not available.
Available engines: 
org.python.jsr223.PyScriptEngineFactory@2b0e6c89
names:
  python
  jython
jdk.nashorn.api.scripting.NashornScriptEngineFactory@46618cb8
names:
  nashorn
  Nashorn
  js
  JS
  JavaScript
  javascript
  ECMAScript
  ecmascript

经理回来了 null python / jython

纳索恩也用同样的方法工作得很好。我对Jython有什么错?